Superheater for boilers



April 8 1924. Q 1,489,660

(5. COOK SUPERHEATER .FOR BOILERS Filed April 19, 1918 2 Sheets-Sheet 1.

George 000/0 'INVENTOR ATTO R N EY A ril 8, 1924.

G. COOK SUPERHEATER FOR BOILERS 1918 2 Sheets-Sheet 2 Filed April 19 ATroRN EY INVENTOR zgedaofig 'lllllll'lllll'llllll Patented Apr. 8, 1924.

UNITED STATES GEORGE coon, or BUFFALO, NEW Yon-K.

ATENT SUPERHEATER FOR BorLER-s.

Application filed April 19, 1918. Serial No. 229,607.

To all whom it may concern:

Be it known that I, Gnoncn Coon, a citizen of the United States, residing at Buffalo, in the county of Erie andState of New York, have invented a new and useful Super-heater for Boilers, of which the following is a specification.

This invention has reference to superheaters for boilers, and its object is to provide a superheater structure along the general lines set forth in Patent No. 1,140,956 granted to me on May 25, 1915. I

One of the objects of the invention is to provide means whereby the superheater elements may be readily replaced from timeto time without the necessity of dismantling.

the structure to any material extent.

The invention will be best understood from" a consideration ofthe following detailed description taken 1n connection with the accompanying drawings forming part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawings but may be changed andmodified so'long as such changes and modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings Figure 1 is an end elevation of so much of a locomotive as is needful for an under-..

standing of the invention, with the shell of the locomotive boiler shown in cross section.

Figure 2 is a longitudinal section on the line 22 of Figure 1.

Figure 3 is a detail elevation of an arrangement for controlling the admission of steam to the locomotive cylinders.

Figure 4 isa longitudinal section with some parts in elevatiomshowing a detail of construction appearing in Figure 2 but on a larger scale.

Figure 5 is a section'of a header. onthe line 55 of Figure 2.

Figure 6 is a section on the Figure 4. j v

Referring to the drawings, there is shown a boiler 1 without any attempt to show any special construction, thereof, and this boiler is assumed to be a locomotive boiler. with cylinders 2, 3 on oppositesides, as is oustomary. The, boiler, is provided with the line of usual saddle 4 which forms no part of the invention but is mentioned merely for the purpose of locating some other parts.

Extending between the, customary flue sheets 5, 6 of the boiler are fire tubes or flues 7 which may be of ordinary construction and require no special description. In conjunc tion with the fire tubes 7 are other larger fire tubes 8 utilized in connection'with the superheater of the invention. Those ends of the tubes adjacent to the fire box of the boiler may be the same size as the tubes 7, while the major portion of the length of the tubes 8 is'larger to accommodate certain structures to be described. Located in each fire tube 8 is a s uperheater element preferably comprising an elongated shell 9, which, as will hereinafter appear, constitutes a superheater compartment for steam. This shell 1s shown 7 in Figures 2 and 4 as entering the fire tube V 8 and extending to a point near the small end thereof and adjacent to such small end has a conicalterminal portion 10 having a threaded extension 12 adapted to. removably receive a cap 13 which snugly fits the conical portion of the shell to protect the same against excessive heat. The otherend of the shell 9 is provided with a head 11 which may be firmly secured therein asbywelding or the like. p

The headll may project for a short distance beyond the exit end ofthe fire tube containing itand within the shell 9 the head 11' carries a pipe 14 of a length to reach approximately to the reducedend 10 of the shell 9. The pipe 14 is readily introduced into theshell 9 through a" suitable hole formed in the head '11 and then tightly expanded therein, or may beotherwise secured, as for instance, before the head 11 is made fast to the corresponding end-of the shell '9. In line with the pipe It is another pipe15 and secured in the head 11 alongside of the pipe 15 is still another pipe 16, the pipes 15 and 16 entering the head 11 from the outside and the pipe 16 terminating at the head 11; In order to accommodate the two pipesthesuperheater shell 9 maybe more or less elliptical or flattened at, the end containing the V head 11 and the shell 9 may have exterior of the fire tube 8. ,Thesefeet may be arranged divergent'lyand serveto space-the shell 9. fromthe inner Wall of the fire tube'8 iii-which the shell is located to permit ample spacers or feet 17 for engag g theinnerwau tube assembly is a header 18 of hollow construction with two ends 19 and top and bottom members 20 and 21 respectively, the header being ireierably although not necessarily of generally rectangular torm. lVitlr in the header is an intermediate web 22 extending throughout the length of the header dividing the latter into outer and inner continuous chambers 23, 2% respectively. Entering the chamber 23 an appropriate point is a pipe 25 leading to the flue or tube sheet 5 where it is joined to the dry pipe 26 coming from the usual steam dome 27 of he boiler. While the pipe 25 might be made in one piece with the header, it is preferably made separate therefrom and joined thereto by bolts 28 or otherwise. Within the smoke chamber of the boiler on opposite sides thereof are tracks 29 carrying rollers 80 supporting hangers 31 made fast to ears 82 on the sides or the header so that by disconnecting the pipe 25 from the pipe 26 the header may be readily moved toward the tr nt or" the smoke box away from the tube sheet 5 to give room for repairs or other purposes.

The pipes 15 and 16 extend forwardly through the space defined by the header and have ret "n be ds which terminate in heads adapted to t in seats 34. about the ports 35, entering'the compar ments 23 and 2e: at the front of the header. The heads or" the pip 1 and 16 are held in place by clamp secured to the header by a bolt 37 havi" its head seated in a groove 38 to perm a limited adjustment and also permitting" the use 0'? bolt it such be found desirable to hold a pair of pipes 15 and 16 in place.

At an appropriate point the chamber 2- is connected through a hollow boss or enlargement 39 with another pipe a'O in turn connected by a pipe ll through the side of the boiler shell to a valve 42. Branched ofi from the valve 42 are pipes 43 and 4e respectively, the pipe 43 leadinginto the steam chest otthe cylinder 2 and the pipe 1% being carried beneath the boiler to the steam chest of the cylinder 3, the pipe n being sustained by clips 45 in turn carried by the saddle i. Communicating with the pipe 4:4: is another'valve e6 connected by a pipe 17 to the pipe 25. On the header side of the point where the pipe 47 joins the pipe 25 there is a valve 48 which maybe readily reached from the outside of the boiler so that communication between thesteam dome 27 and the header 18 may be cut oil when desired. The valves 42 and d6 are under the control of appropriate reach rods 49 which may be assumed to extend to the cab of the locomotiveso as to be under the control of the engineer, or any other arrangement may be provided for controlling these valves. In order to prevent harmful esaseo' pocketing of condensed steam the pipe at is shown as provided with a relief valve and a drain cool: 51, the relief valve 50 being automatic in its action while the drain cock 51 may be opened and closed at will.

l fh n the boiler producing steam and the valve a8 is opened, and further steam is being used in the cylinders 2 and 3, the steam directly from the boiler passes into the chamber 23 of th header and is ditribiit-ed about the same and through the ports the chamber 23 to the several pipes 167 The steam enters that end of each shell 9 remote from the small end thereof and flows to said small end before it can reach the open end of the pipe 1 1, where- ;tore, the steam is progressively superheated until it reaches the hottest portion of the shell 9 which is that portion first engaged by the hot gases of combustion. Then the steam passes through the pipes 1e and 15 through compartment 24: and by way of the enlargement 39 and pipe 40 to the valve 12 from which the steam is distributed by the pipe to both the cylinder 2 and the pipe 44, the last named pipe conducting the steam to the cylinder 3. It will be understood that in the practical embodiment of the invention all those pipes exposed outol the boiler and subjected 'moreor less to the chilling effect of the atmosphere may be covered with some heat insulating material. This being a common practice it is deemed unnecessary to either show or particularly describe such expedient.

Under ordinary conditions of the snoerheater tines 8 break down or burn out much more frequently than do the fines .7 and must be renewed oftener. l-lereto'tore, it has been found necessary to dismantl and move the header 18 out of the way in order to repair or replace even one of the ilucs 8. With the arrangement shown in the drawings, any one or more of the. tines 8 may be readily reached and repaired or removed and replaced without disturbing the header at all, and in most instances without disturbing any pair of pipes 15 and 16 except the pair or pairs belonging to the parts to be fixed. By a proper disposition of the pipes and lines it is quite feasible to reduce the dismantling to a single pair of pipes 15 and 16 and the parts directly con- I nected therewith. Even in the arrangement.

46 is opened, whereupon, steam directly from the steam dome 27 will flow by way of the pipe 26, pipe 25, pipe 47 to the pipe 4% and flow therefrom directly to the cylinder 8 and by way of the pipe 43 to the cylinder 2, thus permitting the running of the locomotive from the place where the superheater went out of commission to a point where boiler, the axes of which pass through said space within the header, superheater elements removably mounted in the enlarged fire tubes, pipes connecting each of said elements with both of said compartments, said pipes extending through the space defined by said header and having return bends in front of said header and connected to the front side thereof, and means for conducting steam to and from said compartments.

2. In a super-heater for locomotive boilers, a continuous substantially rectangular header substantially rectangular in cross section arranged in the smoke box, said header defining a space between theinner Walls thereof, a continuous partition dividing the header into an outer saturatedsteam compartment and an inner superheated steam compartment, a plurality of enlarged fire tubes in the boiler, the axes of which pass through said space, superheater elements in some of said fire tubes, a pair of pipes connected to each of said elements extending forwardly through the space defined by the header and removably connected to the front Wall of the header, one pipe communicating with the saturated steam compartment 7 and the other with the superheated steam compartment, and conduits for conducting steam to and from said compartments.

3. In a .superheater for locomotive boilers, a continuous rectangular header in the smoke box defining a rectangular space, a continuous webin said header dividing it into two compartments, one surrounding the; other, slots being provided 111 the front wall of said header in the plane of said web, superheater elements in some of 'the fire tubes of the boiler, a pair of pipes connecting each of'said elements with the respective compartments of the header passing through the space defined by said nected through the front wall thereof, and

means in said slots for securing said pipes in steam tight engagement with said header.

4. In a superheater for boilers, a fire tube V of enlarged diameter havinga reduced end header and con I near the fire box, a shell within said fire tube, means to hold said shell spaced therefrom, said shell having a reduced end near the reduced end of the fire tube and exteriorly screw threaded, a cap provided with internal threads adapted to engage the threads upon said shell end to protect the same, means closing the other end of the shell, a header, pipes leading from the header to said shell, one of said pipes de-. livering boiler steam to the reduced en'd of the shell, the other conducting superheated steam from the opposite end of the shell.

In testimony,

ture.

GEORGE 000 that I claim the foregoing as 7 my own I have hereto aflixed my 'signa-' 

